I got a very simple test I am writing to do a client server communication sample in .NET Standard (1.4).
At runtime I got a type load exception as follows:

System.IO.FileNotFoundException: ‘Could not load file or assembly ‘System.Net.Sockets, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified.’

There is no System.Net.Sockets in the .NET Framework. I was expecting some binding redirect magic that would solve the problem. The .NET Standard System.Net.Sockets package declare it supports .NET Framework 4.6. Sockets are in System.dll on the desktop.